Search code examples
clojuredecimal

Clojure rounding to decimal places

I have strings which represents the decimal values, ex: "0.010", "0.0100000" "00.01000"

I want to round them to specified format, ex: #.##

In Java we have:

public BigDecimal setScale(int newScale, RoundingMode roundingMode) {
    return setScale(newScale, roundingMode.oldMode);
}

What is the best approach to achieve this in Clojure rather than using interop?

Solution

  • You can use Clojure's format for this purpose. It should provide you a solution to your problem. Here are some examples and a reference:

    user=> (format "%.2f" 0.010)
"0.01"
user=> (format "%.2f" 0.010000)
"0.01"
user=> (format "%.2f" 00.010000000)


user=> (doc format)
-------------------------
clojure.core/format
([fmt & args])
  Formats a string using java.lang.String.format, see java.util.Formatter for format
  string syntax